Phillips N, van Deursen R W
Physiotherapy Department, Cardiff University, Research Centre for Clinical Kinaesiology, School of Healthcare Studies, Cardiff, UK.
Phys Ther Sport. 2008 Nov;9(4):193-201. doi: 10.1016/j.ptsp.2008.06.010. Epub 2008 Aug 19.
To compare the temporal effectiveness of landing strategies in anterior cruciate ligament deficient (ACLD) versus non-injured participants, when they landed on one leg after running or after a single leg hop.
Case control study.
Laboratory setting.
Participants were 30 ACLD patients and 30 control subjects.
Time to stabilise (TTS) was measured using centre of pressure (COP), horizontal (Fy) and vertical (Fz) force velocity on a Kistler forceplate. Kinematic data were collected using a Vicon 512 system with 8 IR cameras. Between group differences were analysed using a two-way ANOVA with post hoc t-tests.
Significant group differences were found in running speed, hop distance, failed attempts, deceleration, and TTS using COP velocity in both activities.
When required to stop and balance on their injured leg, ACLD participants selected slower running speeds and less hop distance to succeed from than did controls, and they used different strategies to stabilise upon landing. They also showed a significantly poorer ability to maintain stable stance following deceleration. ACLD individuals who were able to adapt with some success did so by increasing the time available to them and limiting function to within the boundaries they can control effectively.
比较前交叉韧带损伤（ACLD）参与者与未受伤参与者在跑步后或单腿跳跃后单腿落地时落地策略的时效性。
病例对照研究。
实验室环境。
30名ACLD患者和30名对照受试者。
使用奇石乐测力平台上的压力中心（COP）、水平力（Fy）和垂直力（Fz）速度测量稳定时间（TTS）。使用带有8个红外摄像头的Vicon 512系统收集运动学数据。组间差异采用双向方差分析和事后t检验进行分析。
在两项活动中，在跑步速度、跳跃距离、失败尝试次数、减速以及使用COP速度测量的TTS方面均发现了显著的组间差异。
当需要用受伤的腿停下来并保持平衡时，ACLD参与者选择的跑步速度较慢，跳跃距离较短，以比对照组更成功地完成动作，并且他们在落地时使用了不同的稳定策略。他们在减速后保持稳定姿势的能力也明显较差。能够成功适应的ACLD个体是通过增加可用时间并将功能限制在他们能够有效控制的范围内来实现的。
